Coding Standards: Rename the `$expires_offset` variable in `cache_javascript_headers()`.

This resolves a WPCS warning:
{{{
Variable "$expiresOffset" is not in valid snake_case format, try "$expires_offset"
}}}

Follow-up to [4109], [21996].

See #59650.
Built from https://develop.svn.wordpress.org/trunk@57532


git-svn-id: http://core.svn.wordpress.org/trunk@57033 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -1548,11 +1548,11 @@ function nocache_headers() {
  * @since 2.1.0
  */
 function cache_javascript_headers() {
-	$expiresOffset = 10 * DAY_IN_SECONDS;
+	$expires_offset = 10 * DAY_IN_SECONDS;
 
 	header( 'Content-Type: text/javascript; charset=' . get_bloginfo( 'charset' ) );
 	header( 'Vary: Accept-Encoding' ); // Handle proxies.
-	header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expiresOffset ) . ' GMT' );
+	header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expires_offset ) . ' GMT' );
 }
 
 /**

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57531';
+$wp_version = '6.5-alpha-57532';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.